Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Merge "bugfix: Unable to locate package python-minimal"
  - bugfix: Unable to locate package python-minimal

    This log shows python-minimal can't be located.
    https://build.opnfv.org/ci/view/qtip/job/qtip-compute-fuel-zte-virtual6-master/21/console

    Change-Id: Idbdd47bae68ac5998c75f33ab8dd2851238d8484
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index f5f1091..edc7b4d 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit f5f1091a7ea26f26799bb7b41a2222dff038ebda
+Subproject commit edc7b4d604bc916705294656886eae8e93f7611f